Evaluation of Marginal Leakage and Strength of Dental Resin Cement Based on Fracture Mechanics

基于断裂力学的牙科树脂水门汀边缘渗漏和强度评价

• 批准号: 01571062
• 负责人: TAKAKUDA Kazuo
• 金额: $ 1.28万
• 依托单位: Tokyo Medical and Dental University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01571062/
• 关键词: Dental Resin Cement; Strength of Adhesives; Marginal Leakage; Fracture Mechanics

We study here the mechanical properties such as adhesive strength and marginal leakages of dental resin cements with the use of fracture mechanical approaches, and obtained the following results :1. The degenerations are induced both in the resins themselves and along the adhesive interfaces. So we first examined the effects of mechanical and environmental factors to the resins by the experiments utilizing the resin specimens and the holders which enable us to apply tensile forces to the specimens in hot water bath. The specimens immersed in hot water without tensile force and those in air with tensile force do not show decrease of adhesive strength. On the other hand, specimens in hot water with tensile force show the considerable decrease of adhesive strength with time.2. On the fracture surface of the above specimens, we could not identify any significant patterns. Hence the degenerations from mechanical and environmental factors are considered to be induced in resin matrix itself.3. Then we examined the strength of adhesive interfaces by the use of DCB specimens with constant opening force and WOL specimens with constant displacement. The specimens are made of stainless steel and the resin cements are either Panavia or Superbond, both of them are popular dental materials in japan. For DCB specimens are instrumented with displacement gauges and load cells for WOL specimens.4. We observed crack openings for Superbond specimens which increase with time, indicating the crack propagations or elongations of resin matrix proceeding the final failure. On the other hand, the crack opening are hardly detectable and the starting of crack propagation immediately succeeded by final failure.5. On the fracture surface of specimens, both of adhesive and cohesive fractures are observed. We conclude that the degenerations are induced in the resin matrix and along the interface, and the mechanical properties of resin cement determined the failure mode.

我们使用断裂力学方法研究了牙科树脂水泥的机械​​性能，例如粘合强度和边缘渗漏，并获得了以下结果：1。变性是在树脂本身和沿粘合界面​​引起的。因此，我们首先通过利用树脂样本和支架进行实验来检查机械和环境因素对树脂的影响，这些样本和支架使我们能够在热水浴中向样本施加拉力。将试样浸入无拉力的热水中和在有拉力的空气中的试样没有表现出粘合强度的下降。另一方面，在热水中施加拉伸力的试样显示出粘合强度随时间显着下降。2．在上述样品的断裂表面上，我们无法识别出任何明显的图案。因此，机械和环境因素的退化被认为是由树脂基体本身引起的。 3．然后，我们使用恒定打开力的 DCB 样本和恒定位移的 WOL 样本检查了粘合界面的强度。标本由不锈钢制成，树脂水泥为Panavia或Superbond，这两种材料都是日本流行的牙科材料。对于 DCB 样本，配备位移计和 WOL 样本称重传感器。4。我们观察到 Superbond 样品的裂纹开口随着时间的推移而增加，表明裂纹扩展或树脂基体的伸长导致最终失效。另一方面，裂纹张开几乎无法检测到，并且裂纹扩展的开始立即导致最终失效。5．在试样的断裂面上，观察到粘着断裂和内聚断裂。我们得出的结论是，变性是在树脂基体中和沿界面引起的，树脂水泥的机械​​性能决定了失效模式。

项目成果

高久田 和夫: "歯科用レジンセメントの耐久性" 歯科材料・器機.

Kazuo Takakuda：“牙科树脂水泥的耐久性”牙科材料和设备。

高久田 和夫: "歯科用レジンセメントの耐久性" 歯科材料・器械.

Kazuo Takakuda：“牙科树脂水泥的耐久性”牙科材料和器械。